+ Site Statistics
+ Search Articles
+ PDF Full Text Service
How our service works
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ Translate
+ Recently Requested

Graben structure in the Las Canadas edifice (Tenerife, Canary Islands); implications for active degassing and insights on the caldera formation



Graben structure in the Las Canadas edifice (Tenerife, Canary Islands); implications for active degassing and insights on the caldera formation



Journal of Volcanology and Geothermal Research 144(1-4): 73-87



A graben structure has been identified at the western area of the Las Canadas caldera wall, here referred as the Los Azulejos Graben. This graben is 1 km wide and is bounded by two major normal faults trending NE-SW, the Los Azulejos Fault and the Ucanca Fault. The graben was active for at least 0.5 Ma, from the end of the Ucanca Fm to the end of the Guajara Fm, and before the collapse of the Las Canadas edifice that formed the western caldera. A right-lateral transtension regime operated in the graben as suggested by small fault orientations and kinematics. The prolongation of the NE rift zone of Tenerife to the Canadas edifice is the most likely volcano-tectonic scenario for the graben. In this context, inflation of phonolitic shallow magma chambers may have produced reverse faults and reactivation of normal faults. An intense and widespread hydrothermal alteration, here called Azulejos-type, occurred mainly before the graben formation, while a fault-related hydrothermal alteration occurred during and after the graben. Diffuse carbon dioxide and hydrogen degassing in and around the Las Canadas caldera show relatively enriched values along a NE-SW trend suggesting that faults in the Los Azulejos Graben act as a pathway for deep-seated gases to the surface. Diffuse degassing and hydrothermalism indicate that the graben area has been a zone of intense fluid circulation during the evolution of the Las Canadas edifice.

Please choose payment method:






(PDF emailed within 0-6 h: $19.90)

Accession: 019094084

Download citation: RISBibTeXText

DOI: 10.1016/j.jvolgeores.2004.11.017


Related references

Evolution of the Canadas edifice and its implications for the origin of the Canadas Caldera (Tenerife, Canary Islands). Journal of Volcanology and Geothermal Research 88(3): 177-199, 1999

Resolving problems with the origin of Las Canadas Caldera Tenerife, Canary Islands; Los Roques de Garcia Formation, part of a major debris avalanche or an in situ, stratified, edifice-building; succession?. Geological Society of America 464, 2010

Le volcanisme acide pre-caldera a Las Canadas, Tenerife (Iles Canaries)--Pre-caldera acidic volcanism in Las Canadas, Tenerife, Canary Islands. Publication Occasionnelle - Centre International Pour la Formation et les Echanges Geologiques = Occasional Publication - International Center for Training and Exchanges in the Geosciences 15: 168-173, 1988

Lithology and structure of the Canadas edifice, Tenerife, Canary islands. Estudios Geologicos 27(2): 95-135, 1971

Petrology and geochemistry of the Bandas del Sur Formation, Las Canadas Edifice, Tenerife (Canary Islands). Journal of Petrology 43(10): 1815-1856, 2002

Stratigraphy, structure and geochronology of the Las Canadas Caldera (Tenerife, Canary Islands). Geological Magazine 131(6): 715-727, 1994

Magnetotelluric study of the Las Canadas Caldera (Tenerife, Canary Islands); structural and hydrogeological implications. Earth and Planetary Science Letters 204(1-2): 249-263, 2002

Soil pH, (super 222) Rn, and Hg anomalies and relation to active volcanic structures in and around Canadas Caldera, Tenerife, Canary Islands, Spain. Abstracts with Programs - Geological Society of America 26(7): 119, 1994

The Las Canadas Caldera (Tenerife, Canary Islands); an overlapping collapse caldera generated by magma-chamber migration. Journal of Volcanology and Geothermal Research 103(1-4): 161-173, 2000

Multiple caldera collapse processes inferred from shallow electrical prints; example of the Las Canadas Caldera, Tenerife, Canary Islands. 2006

Multiple caldera collapses inferred from the shallow electrical resistivity signature of the Las Canadas Caldera, Tenerife, Canary Islands. Journal of Volcanology and Geothermal Research 170(3-4): 153-166, 2008

Soil B and NH (sub 4) (super +) anomalies related to active volcanic structures and zones of high heat flow in and around Canadas Caldera, Tenerife, Canary Islands, Spain. Abstracts with Programs - Geological Society of America 27(6): 90, 1995

Geochronology of the Canadas caldera wall, Tenerife, Canary Islands. Boletin de la Real Sociedad Espanola de Historia Natural, Seccion Geologica 90(1-4): 107-124, 1995

Chronology and evolution of the Canadas Caldera, Tenerife, Canary Islands. Boletin Geologico y Minero 111(2-3): 3-16, 2000

Magnetotelluric investigation of the Canadas Caldera, Tenerife (Canary Islands). Pages 95 2001, 2001